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Old February 14, 2013, 11:44 AM   #18
Join Date: March 4, 2005
Location: Ohio
Posts: 11,547
It's a die that has a probe that touches the top of the powder column to see how high it is. If it's too high or too low for a good charge weight, it either sounds an alarm or mechanically stops the press from advancing until you fix the problem.
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